webadmin: import FCP data storage domain dialog

Import domain dialog ->
added a view for import FCP data domain which contains a panel for
storage domains that are candidate for import.

Feature page:
http://www.ovirt.org/Features/ImportStorageDomain#GUI_Perspective_2

Change-Id: I529680fbf0180874ffad02a050601fd1294fbec1
Signed-off-by: Daniel Erez <derez@redhat.com>